I did talk to him once shortly, pretending to be interested in an apartment he had for rent in order to get some background on him. The "leave a message" greeting sounds like the same tone and accent, but I know with just three words, I can't be sure, but is the same kind of greeting he had on his old cell phone.
Yea its all speculation at this point (altho I'm contemplating calling the number again, can I pull off being interested in an apartment again?), but a lot of things lately are adding up to this scenario fitting the best with how she is acting lately and her one line comments, rather than just being depressed. Hard to get into it without writing alot, but like clearing the call history on her cell phone, they are the kind of actions that only occurred when OM was on the scene.